Power-on reset circuit device for multi-level power supply sourc

Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons

Patent

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Details

3072964, 3072965, 307491, 307355, 307356, 307264, 307592, 307594, H03K 301, G06G 710

Patent

active

052143163

ABSTRACT:
A power-on reset circuit device has a first power-on reset circuit which outputs a first reset signal, when an external power supply voltage reaches a first reference voltage, for resetting a DC-DC converter for producing a plurality of internal power supply voltages; a second power-on reset circuit which outputs a second reset signal, when the internal power supply voltage produced by the DC-DC converter reaches a second reference voltage, for resetting an internal circuit; and transistor switches for respectively inactivating the first power-on reset circuit and fixing the level of the first reset signal in response to the second reset signal. Power consumed by the power-on reset circuit device can be kept low because, in response to the second reset signal, the first power-on reset circuit is inactivated by the second power-on reset circuit. The power-on reset circuit device can be formed by a small number of circuit components required.

REFERENCES:
patent: 5153452 (1992-10-01), Iwamura et al.

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